Everything you know about this engine?

96 Mustang that my friend owns.
Their ex husband bought this for them years ago.
We're not sure if any of this is factory or all rebuilt, or if it is Ford or other?

Any details on this would be great. Thank you! Everything you know about this engine

It's a factory 3.8, it had head gaskets done at the time someone painted all that orange in it. Most looks old, like factory parts

It is painted Chevy orange.

The orange is custom, other than that the difference between OEM and performance parts often bear little visible indicators, but considering the odd effort to paint the engine (a non-Ford color) it is quite possible some of the parts have been upgraded when disassembled for painting, but upgrading the air intake is a basic cheap upgrade, and since it looks like the air intake housing is stock it is also possible no upgrades have been performed.

Another point is it is somewhat pointless to try to make a high performance vehicle out of a V6 Mustang since you have to spend a lot to just catch up with the stock V8 power.